I went to a bar/restaurant in Utah recently that scanned everyone's IDs at the entrance - their little handheld reader pulled my name and computed my age from the barcode on the back of my NC DL. They said it works for most states, but it didn't work on a friend's from MN

Edit: Also, the new (ugly, pastel-ey) NC drivers licenses also appear to have a 1-D barcode on them as well

WA IDs aren't encrypted at least, any PDF417 reader on the app store shows the data as plaintext for my ID.